Hundreds of people from across Europe were made to sit in lines while police processed them after clashes

He has lucrative consultancies with JP Morgan and Zurich Financial, charges thousands of pounds for public speeches and set up Tony Blair Associates to advise foreign countries.

He also set up a series of mysterious 'Windrush ventures' soon after he left office - but failed to register them with the watchdog set up to monitor ex-ministers' appointments.

Mr Blair's spokesman described the Windrush ventures as an 'administration vehicle' and so did not need to be disclosed. Earlier this month it emerged that one of the Windrush ventures had registered the online domain name Low Carbon Capital Fund.

Mr Blair's office said only: 'From time to time, we register names in an area we may be interested in.

Mr Blair's appearance came as Gordon Brown prepared to fly to Copenhagen early, amid fears the talks are on the brink of collapse.

The Prime Minister is due to arrive at the summit tomorrow, two days ahead of schedule, to put pressure on developing countries.

A demonstrator dressed as a clown parades in front of police outside the 'climate prison' in a peaceful protest yesterday

In public the Government says the talks are on course for a political deal that will cut the world's greenhouse gas emissions and prevent temperatures rising by more than 2C this century.

But behind the scenes, serious divisions are growing between the rich and poor nations over the size of carbon dioxide targets, whether poorer countries should be exempt from the deal and how much the West should pay to help the developing world tackle the issue.

A Government spokesman played down the divisions, adding: 'The Prime Minister is keen to raise ambitions'.

Meanwhile, Climate Change Secretary Ed Miliband today called on environment ministers to 'get their act together' to put international talks on global warming back on track and deal with unresolved issues.

Speaking in Copenhagen, the Mr Miliband urged delegates to make progress before national leaders arrive later this week.

He said: 'We need to collectively get our act together and move on and find ways in which we can solve the difficult issues, because these issues that I've mentioned can't all be left to leaders.

'It may be the case that some final issues remain when leaders arrive.

'I've always said the leaders' role in this process is incredibly important to get the final pieces of the jigsaw in place. But what we cannot do is leave a whole slew of issues to leaders.

'I think that the very clear message for negotiators and ministers is we need to get our act together and take action to resolve some of the outstanding issues that we face.'

Pacific island Tuvalu has asked for the target to limit global warming to 2C to be brought down to 1.5C.

Mr Miliband said the request should be heeded but the existing plan was 'deliverable'.He went on: 'The presence of countries like Tuvalu who face immediate and growing threats to their very existence is a salutary reminder of the urgency of this crisis. I think we should go for the most ambition that we should get.

'The truth is, as a result of the emissions already in the atmosphere we are likely to see warming of 1.4 degrees.

'That's why we have taken the position because we think it is a deliverable position to limit warming to no more than two degrees.'

A key issue facing those at the meeting is whether they are willing to deliver on the commitments made.

Mr Miliband said: 'There are two outstanding issues that I think all countries face, frankly, in this, which is whether we are willing to stand behind our commitments and say that we're going to do what we promise and, secondly, the precise system of monitoring, reporting and verification to make sure people actually follow through on what they promise.'

He was joined by International Development Secretary Douglas Alexander, who said the fight against global warming was tied to the battle against poverty.

A police officer stands beside female protestors after they were restrained following an unauthorised demonstration in the northern section of Copenhagen yesterday

Mr Alexander said: 'The challenge of tackling dangerous climate change and tackling extreme global poverty are now indivisible. For the developing world, climate change is not a future threat, but a contemporary crisis.'

Police cracked down on climate activists marching through the Danish capital yesterday.

More than 200 were detained as police stopped an unauthorized demonstration headed toward the city's harbor and carried out a security check of some of the participants.

Meanwhile, nearly all of the 1,000 detained on Saturday - from Europe, Africa, Asia, and the U.S - were released without charges.

Thirteen of them were arraigned in court and faced preliminary charges of assaulting police or were let off with a warning for wearing masks, which are outlawed during demonstrations in Denmark, or carrying box-cutters or other sharp objects.

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Is Blair trying to cash in on climate change?: Ex-PM arrives at summit to urge greenhouse gas deal